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EP0545789A1 - Expansion tank for a boiling liquid cooling circuit - Google Patents

Expansion tank for a boiling liquid cooling circuit Download PDF

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Publication number
EP0545789A1
EP0545789A1 EP92403195A EP92403195A EP0545789A1 EP 0545789 A1 EP0545789 A1 EP 0545789A1 EP 92403195 A EP92403195 A EP 92403195A EP 92403195 A EP92403195 A EP 92403195A EP 0545789 A1 EP0545789 A1 EP 0545789A1
Authority
EP
European Patent Office
Prior art keywords
membrane
expansion vessel
fluid
interior
expansion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92403195A
Other languages
German (de)
French (fr)
Inventor
Ngy Srun Ap
Michel Potier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0545789A1 publication Critical patent/EP0545789A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F01P11/0209—Closure caps
    • F01P11/0238—Closure caps with overpressure valves or vent valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F01P11/0209—Closure caps
    • F01P2011/0271—Semi-permeable, e.g. using Gore-Tex c fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2070/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point

Definitions

  • the invention relates to an expansion vessel for a circuit intended for the circulation, substantially under atmospheric pressure, of a fluid which can pass at least partly from the liquid state to the gaseous state and vice versa, in particular a circuit for cooling the heat engine of a motor vehicle.
  • the change of state of the fluid under atmospheric pressure is accompanied by large variations in volume, which must be absorbed by the expansion vessel, which must also be closed to prevent the escape of the vapor of the fluid.
  • the volume available for the fluid inside the expansion tank is substantially constant, the variable fraction of this volume which is not occupied by the fluid must be by air, which implies the possibility for air to enter the expansion tank and to come out according to the variation of the volume of the fluid.
  • the object of the invention is to allow these air movements, while avoiding the loss of vapor from the fluid.
  • the expansion vessel comprises at its upper part an air permeable membrane and substantially impermeable to the vapor of said fluid, mounted in a filling cap equipped with pressure and vacuum relief valves on a path located in parallel with these two valves. These valves allow air to enter or exit in case, for whatever reason, the membrane no longer allows sufficient flow.
  • the generally thin and relatively fragile membrane is advantageously held by two grids arranged on its two faces respectively.
  • the stopper may comprise a tubular body in which extend an intermediate transverse wall and a central tube directed towards the interior of the expansion vessel from the latter, the membrane being annular in shape and extending radially around the central tube, the intermediate wall defining in the tubular body an external space which contains the two valves and which communicates with the interior of the expansion vessel exclusively via the central tube, and an interior space which communicates with the interior of the expansion vessel exclusively through the membrane, these two spaces communicating freely with the exterior atmosphere.
  • the expansion tank illustrated in FIG. 1, intended to form part of the cooling circuit of a heat engine of a motor vehicle, comprises a tank 1 elongated in height, closed in leaktight manner by a cover 2, for example welded.
  • a transverse partition 3, the periphery of which is tightly connected to the wall of the tank 1 separates the interior of the expansion tank in a main tank 4 located above the partition 3 and in an annex tank 5, of smaller diameter, located below.
  • the partition 3 comprises a frustoconical annular region 6, with a half-angle at the apex slightly less than 90 °, rising in the direction of the axis, connected by a cylindrical intermediate region 7 to a central region 8, flat and horizontal, having a central hole 9.
  • the cylindrical region 7 has vertical internal ribs 10 suitable for guiding a ball 11, with a density less than that of the fluid in the liquid state and greater than that of the fluid in the state gaseous, between an extreme upper position where it comes into contact with the horizontal region 8 by closing the hole 9 and an extreme lower position where it rests on a retaining grid 12 fixed to the partition 3.
  • the annex tank 5 is connected to the rest of the fluid circuit by two superposed pipes 13 and 14, and allows the degassing of the fluid circulating in a restricted part of the circuit, during the cold engine start-up phase, without overheating the totali t of the fluid contained in the expansion tank, as described in FR-A-2 640 364 to which reference may be made for more details concerning its operation.
  • the main tank 4 is also connected to the rest of the circuit, in known manner, by an upper tube 15 for the entry of gases, opening at a small distance below the cover 2, and by a lower tube 16 for the return of the liquid, opening a short distance above the partition 3.
  • the cover 2 is provided with an open neck 17 allowing the filling of the expansion vessel, on which is mounted a cap 18 equipped with two valves or valves which open respectively in the event of overpressure and in the event of depression in the expansion tank.
  • the cover 2 has a second neck 19 receiving a second plug 20 which applies against the neck, with the interposition of a sealing ring 21, a flat assembly 22 comprising (see FIG. 2) a thin membrane 23 trapped between two rigid grids 24 and 25.
  • the membrane 23 is permeable air, and substantially impermeable to water vapor, water being the essential constituent of the cooling fluid. It is also impermeable to the vapors of other possible constituents of the fluid, whose molecules are larger than those of water. It may for example be a membrane marketed by GORETEX, having open pores with a diameter of approximately 3 microns.
  • FIG. 3 relates to a variant in which the cover of the expansion tank has a single neck 30 receiving a plug 31 which combines the functions of the plugs 18 and 20 of FIG. 1.
  • This plug comprises a tubular body 32 which penetrates into the neck 30 and which carries in an outer annular groove an O-ring 33 ensuring the seal between the neck and the body 32.
  • the plug also comprises, formed in one piece with the tubular body, an internal transverse wall 34 pierced with 'a central opening 35 and a central tube 36 surrounding the opening 35 and extending downward, that is to say towards the inside of the expansion vessel, from the wall 34.
  • a flat assembly 37 comprising a semi-permeable membrane and two grids, similar to the assembly 22 of Figures 1 and 2 but having a central opening, extends radially between the tube 36 and the tubular body 32 to which it is tightly connected for example by ul welding bother.
  • An annular chamber 38 limited upwards by the partition 34, downwards by the assembly 37, towards the periphery by the body 32 and towards the center by the tube 36, communicates with the interior of the vessel expansion exclusively through the semi-permeable membrane, and communicates freely, through an opening 39 of the plug, with a lateral tube 40 formed in one piece with the neck 30.
  • a piece 41 in the form of cap rests, via a sealing ring 42, on the upper face of the wall 34, against which it is applied by a helical spring 43 bearing on an element 44 secured to the plug.
  • Another helical spring 45 placed inside the part 41 and bearing on the wall 34, applies a seal 46 to an opening 47 in the bottom of the cap 41.
  • air can pass from the interior of the expansion tank to the outside atmosphere by passing through the semi-permeable membrane of the assembly 37 and passing through the chamber 38, the opening 39 and the tubing 40, and air can enter the expansion tank following the reverse path.
  • this overpressure is transmitted through the tube 36 inside the cap-shaped part 41, which lifts by compressing the spring 43 and allows the air to reach the space 48 located inside the stopper, above the wall 34 and outside the part 41, this space also communicating with the pipe 40 through the opening 39.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Closures For Containers (AREA)

Abstract

Expansion bottle for circuit intended for circulation, substantially under atmospheric pressure, of a fluid which can at least partly pass from the liquid state to the gaseous state and vice versa, characterised in that it comprises, at its upper end, an air-permeable membrane (23) which is substantially impermeable to the vapour of the said fluid, the only passage possible normally between inside the expansion bottle and the external atmosphere taking place through the membrane. Application to the cooling circuits for motor vehicles. <IMAGE>

Description

L'invention concerne un vase d'expansion pour un circuit destiné à la circulation, sensiblement sous la pression atmosphérique, d'un fluide qui peut passer au moins en partie de l'état liquide à l'état gazeux et inversement, notamment un circuit de refroidissement du moteur thermique d'un véhicule automobile.The invention relates to an expansion vessel for a circuit intended for the circulation, substantially under atmospheric pressure, of a fluid which can pass at least partly from the liquid state to the gaseous state and vice versa, in particular a circuit for cooling the heat engine of a motor vehicle.

Le changement d'état du fluide sous la pression atmosphérique s'accompagne de variations de volume importantes, qui doivent être absorbées par le vase d'expansion, lequel doit en outre être fermé pour éviter l'échappement de la vapeur du fluide. Lorsque, à défaut de moyens particuliers prévus pour le faire varier, le volume disponible pour le fluide à l'intérieur du vase d'expansion est sensiblement constant, la fraction variable de ce volume qui n'est pas occupée par le fluide doit l'être par de l'air, ce qui implique la possibilité pour l'air d'entrer dans le vase d'expansion et de ressortir en fonction de la variation du volume du fluide.The change of state of the fluid under atmospheric pressure is accompanied by large variations in volume, which must be absorbed by the expansion vessel, which must also be closed to prevent the escape of the vapor of the fluid. When, in the absence of particular means provided for varying it, the volume available for the fluid inside the expansion tank is substantially constant, the variable fraction of this volume which is not occupied by the fluid must be by air, which implies the possibility for air to enter the expansion tank and to come out according to the variation of the volume of the fluid.

Le but de l'invention est de permettre ces mouvements d'air, tout en évitant les pertes de vapeur du fluide.The object of the invention is to allow these air movements, while avoiding the loss of vapor from the fluid.

A cet effet, selon l'invention, le vase d'expansion comprend à sa partie supérieure une membrane perméable à l'air et sensiblement imperméable à la vapeur dudit fluide, montée dans un bouchon de remplissage équipé de soupapes de surpression et de dépression sur un trajet situé en parallèle avec ces deux soupapes. Ces soupapes permettent à l'air d'entrer ou de sortir au cas où, pour une raison quelconque, la membrane ne permettrait plus un débit suffisant.To this end, according to the invention, the expansion vessel comprises at its upper part an air permeable membrane and substantially impermeable to the vapor of said fluid, mounted in a filling cap equipped with pressure and vacuum relief valves on a path located in parallel with these two valves. These valves allow air to enter or exit in case, for whatever reason, the membrane no longer allows sufficient flow.

La membrane, généralement mince et relativement fragile, est avantageusement maintenue par deux grilles disposées sur ses deux faces respectivement.The generally thin and relatively fragile membrane is advantageously held by two grids arranged on its two faces respectively.

Selon un mode de réalisation de l'invention, le bouchon peut comprendre un corps tubulaire dans lequel s'étendent une paroi transversale intermédiaire et un tube central dirigé vers l'intérieur du vase d'expansion à partir de celle-ci, la membrane étant de forme annulaire et s'étendant radialement autour du tube central, la paroi intermédiaire définissant dans le corps tubulaire un espace extérieur qui contient les deux soupapes et qui communique avec l'intérieur du vase d'expansion exclusivement par l'intermédiaire du tube central, et un espace intérieur qui communique avec l'intérieur du vase d'expansion exclusivement à travers la membrane, ces deux espaces communiquant librement avec l'atmosphère extérieure.According to one embodiment of the invention, the stopper may comprise a tubular body in which extend an intermediate transverse wall and a central tube directed towards the interior of the expansion vessel from the latter, the membrane being annular in shape and extending radially around the central tube, the intermediate wall defining in the tubular body an external space which contains the two valves and which communicates with the interior of the expansion vessel exclusively via the central tube, and an interior space which communicates with the interior of the expansion vessel exclusively through the membrane, these two spaces communicating freely with the exterior atmosphere.

D'autres caractéristiques et avantages de l'invention ressortiront de la description détaillée donnée ci-après de quelques exemples de réalisation, et des dessins annexés dans lesquels :

  • la figure 1 est une vue en élévation, partiellement en coupe, d'un vase d'expansion selon l'invention ;
  • la figure 2 est un détail agrandi de la figure 1 ; et
  • la figure 3 et une vue en coupe d'un bouchon de remplissage utilisé dans une variante de l'invention.
Other characteristics and advantages of the invention will emerge from the detailed description given below of a few exemplary embodiments, and from the appended drawings in which:
  • Figure 1 is an elevational view, partially in section, of an expansion tank according to the invention;
  • Figure 2 is an enlarged detail of Figure 1; and
  • Figure 3 and a sectional view of a filling plug used in a variant of the invention.

Le vase d'expansion illustré à la figure 1, destiné à faire partie du circuit de refroidissement d'un moteur thermique de véhicule automobile, comprend un bac 1 allongé en hauteur,fermé de façon étanche par un couvercle 2 par exemple soudé. Une cloison transversale 3 dont la périphérie est liée de façon étanche à la paroi du bac 1 sépare l'intérieur du vase d'expansion en un réservoir principal 4 situé au-dessus de la cloison 3 et en un réservoir annexe 5, de plus petit diamètre, situé au-dessous. La cloison 3 comporte une région annulaire tronconique 6, de demi-angle au sommet peu inférieur à 90°, s'élevant en direction de l'axe, raccordée par une région intermédiaire cylindrique 7 à une région centrale 8, plane et horizontale, présentant un trou médian 9. La région cylindrique 7 présente des nervures internes verticales 10 propres à assurer le guidage d'une bille 11, d'une densité inférieure à celle du fluide à l'état liquide et supérieure à celle du fluide à l'état gazeux, entre une position extrême supérieure où elle vient en contact avec la région horizontale 8 en obturant le trou 9 et une position extrême inférieure où elle repose sur une grille de retenue 12 fixée à la cloison 3. Le réservoir annexe 5 est relié au reste du circuit du fluide par deux tubulures superposées 13 et 14, et permet le dégazage du fluide circulant dans une partie restreinte du circuit, lors de la phase de démarrage du moteur à froid, sans échauffer la totalité du fluide contenu dans le vase d'expansion, comme décrit dans FR-A-2 640 364 auquel on pourra se reporter pour plus de détails concernant son fonctionnement.The expansion tank illustrated in FIG. 1, intended to form part of the cooling circuit of a heat engine of a motor vehicle, comprises a tank 1 elongated in height, closed in leaktight manner by a cover 2, for example welded. A transverse partition 3, the periphery of which is tightly connected to the wall of the tank 1 separates the interior of the expansion tank in a main tank 4 located above the partition 3 and in an annex tank 5, of smaller diameter, located below. The partition 3 comprises a frustoconical annular region 6, with a half-angle at the apex slightly less than 90 °, rising in the direction of the axis, connected by a cylindrical intermediate region 7 to a central region 8, flat and horizontal, having a central hole 9. The cylindrical region 7 has vertical internal ribs 10 suitable for guiding a ball 11, with a density less than that of the fluid in the liquid state and greater than that of the fluid in the state gaseous, between an extreme upper position where it comes into contact with the horizontal region 8 by closing the hole 9 and an extreme lower position where it rests on a retaining grid 12 fixed to the partition 3. The annex tank 5 is connected to the rest of the fluid circuit by two superposed pipes 13 and 14, and allows the degassing of the fluid circulating in a restricted part of the circuit, during the cold engine start-up phase, without overheating the totali t of the fluid contained in the expansion tank, as described in FR-A-2 640 364 to which reference may be made for more details concerning its operation.

Le réservoir principal 4 est également raccordé au reste du circuit, de façon connue, par une tubulure supérieure 15 pour l'entrée des gaz, débouchant à une faible distance au-dessous du couvercle 2, et par une tubulure inférieure 16 pour le retour du liquide, débouchant à une faible distance au-dessus de la cloison 3. De façon également connue, le couvercle 2 est muni d'un col ouvert 17 permettant le remplissage du vase d'expansion, sur lequel est monté un bouchon 18 équipé de deux soupapes ou clapets qui s'ouvrent respectivement en cas de surpression et en cas de dépression dans le vase d'expansion.The main tank 4 is also connected to the rest of the circuit, in known manner, by an upper tube 15 for the entry of gases, opening at a small distance below the cover 2, and by a lower tube 16 for the return of the liquid, opening a short distance above the partition 3. In a manner also known, the cover 2 is provided with an open neck 17 allowing the filling of the expansion vessel, on which is mounted a cap 18 equipped with two valves or valves which open respectively in the event of overpressure and in the event of depression in the expansion tank.

Selon l'invention, le couvercle 2 présente un second col 19 recevant un second bouchon 20 qui applique contre le col, avec interposition d'une bague d'étanchéité 21, un ensemble plat 22 comprenant (voir figure 2) une membrane mince 23 emprisonnée entre deux grilles rigides 24 et 25. La membrane 23 est perméable à l'air, et sensiblement imperméable à la vapeur d'eau, l'eau étant le constituant essentiel du fluide de refroidissement. Elle est également imperméable aux vapeurs des autres constituants éventuels du fluide, dont les molécules sont plus grosses que celles de l'eau. Il peut s'agir par exemple d'une membrane commercialisée par GORETEX, présentant des pores ouverts d'un diamètre de 3 microns environ. Lorsque le volume du fluide dans le circuit augmente par suite de sa vaporisation, une partie de l'air surmontant le liquide dans le réservoir d'expansion peut s'échapper à travers la membrane 23 et gagner l'atmosphère en passant par un orifice 26 ménagé dans le bouchon 20. De même, lorsque le volume du fluide diminue, de l'air provenant de l'atmosphère peut venir remplir le volume libéré dans le vase d'expansion en empruntant le trajet inverse. En revanche, la vapeur du fluide de refroidissement qui est mélangée à l'air à l'intérieur du vase d'expansion ne peut traverser la membrane, ce qui permet de conserver la quantité de fluide contenue dans le circuit de refroidissement.According to the invention, the cover 2 has a second neck 19 receiving a second plug 20 which applies against the neck, with the interposition of a sealing ring 21, a flat assembly 22 comprising (see FIG. 2) a thin membrane 23 trapped between two rigid grids 24 and 25. The membrane 23 is permeable air, and substantially impermeable to water vapor, water being the essential constituent of the cooling fluid. It is also impermeable to the vapors of other possible constituents of the fluid, whose molecules are larger than those of water. It may for example be a membrane marketed by GORETEX, having open pores with a diameter of approximately 3 microns. When the volume of the fluid in the circuit increases as a result of its vaporization, part of the air surmounting the liquid in the expansion tank can escape through the membrane 23 and gain the atmosphere by passing through an orifice 26 formed in the plug 20. Similarly, when the volume of the fluid decreases, air from the atmosphere can come fill the volume released in the expansion tank by taking the reverse path. On the other hand, the vapor of the cooling fluid which is mixed with the air inside the expansion tank cannot pass through the membrane, which makes it possible to conserve the quantity of fluid contained in the cooling circuit.

La figure 3 est relative à une variante dans laquelle le couvercle du vase d'expansion présente un seul col 30 recevant un bouchon 31 qui cumule les fonctions des bouchons 18 et 20 de la figure 1. Ce bouchon comprend un corps tubulaire 32 qui pénètre dans le col 30 et qui porte dans une gorge annulaire extérieure un joint torique 33 assurant l'étanchéité entre le col et le corps 32. Le bouchon comprend également, formés d'une seule pièce avec le corps tubulaire, une paroi transversale interne 34 percée d'une ouverture centrale 35 et un tube central 36 entourant l'ouverture 35 et s'étendant vers le bas, c'est-à-dire vers l'intérieur du vase d'expansion, à partir de la paroi 34. Un ensemble plat 37 comprenant une membrane semi-perméable et deux grilles, analogue à l'ensemble 22 des figures 1 et 2 mais présentant une ouverture centrale, s'étend radialement entre le tube 36 et le corps tubulaire 32 auxquels il est relié de façon étanche par exemple par soudage par ultrasons. Une chambre annulaire 38 limitée vers le haut par la cloison 34, vers le bas par l'ensemble 37, vers la périphérie par le corps 32 et vers le centre par le tube 36, communique avec l'intérieur du vase d'expansion exclusivement à travers la membrane semi-perméable, et communique librement, à travers une ouverture 39 du bouchon, avec une tubulure latérale 40 formée d'une seule pièce avec le col 30. Le bord d'une pièce 41 en forme de chapeau repose, par l'intermédiaire d'une bague d'étanchéité 42, sur la face supérieure de la paroi 34, contre laquelle il est appliqué par un ressort hélicoïdal 43 prenant appui sur un élément 44 solidaire du bouchon. Un autre ressort hélicoïdal 45, placé à l'intérieur de la pièce 41 et prenant appui sur la paroi 34, applique un joint d'étanchéité 46 sur une ouverture 47 du fond du chapeau 41.FIG. 3 relates to a variant in which the cover of the expansion tank has a single neck 30 receiving a plug 31 which combines the functions of the plugs 18 and 20 of FIG. 1. This plug comprises a tubular body 32 which penetrates into the neck 30 and which carries in an outer annular groove an O-ring 33 ensuring the seal between the neck and the body 32. The plug also comprises, formed in one piece with the tubular body, an internal transverse wall 34 pierced with 'a central opening 35 and a central tube 36 surrounding the opening 35 and extending downward, that is to say towards the inside of the expansion vessel, from the wall 34. A flat assembly 37 comprising a semi-permeable membrane and two grids, similar to the assembly 22 of Figures 1 and 2 but having a central opening, extends radially between the tube 36 and the tubular body 32 to which it is tightly connected for example by ul welding bother. An annular chamber 38 limited upwards by the partition 34, downwards by the assembly 37, towards the periphery by the body 32 and towards the center by the tube 36, communicates with the interior of the vessel expansion exclusively through the semi-permeable membrane, and communicates freely, through an opening 39 of the plug, with a lateral tube 40 formed in one piece with the neck 30. The edge of a piece 41 in the form of cap rests, via a sealing ring 42, on the upper face of the wall 34, against which it is applied by a helical spring 43 bearing on an element 44 secured to the plug. Another helical spring 45, placed inside the part 41 and bearing on the wall 34, applies a seal 46 to an opening 47 in the bottom of the cap 41.

En fonctionnement normal, de l'air peut passer de l'intérieur du vase d'expansion à l'atmosphère extérieure en traversant la membrane semi-perméable de l'ensemble 37 et en passant par la chambre 38, l'ouverture 39 et la tubulure 40, et de l'air peut entrer dans le vase d'expansion en suivant le trajet inverse. En cas de surpression dans le vase d'expansion, cette surpression est transmise à travers le tube 36 à l'intérieur de la pièce en forme de chapeau 41, laquelle se soulève en comprimant le ressort 43 et permet à l'air d'atteindre l'espace 48 situé à l'intérieur du bouchon, au-dessus de la paroi 34 et à l'extérieur de la pièce 41, cet espace communiquant également avec la tubulure 40 par l'ouverture 39. En cas de dépression dans le vase d'expansion, la pression atmosphérique régnant dans l'espace 48 et agissant sur le joint 46 à travers l'ouverture 47 entraîne la compression du ressort 45, le joint 46 dégageant l'ouverture 47 et permettant à l'air atmosphérique de pénétrer à l'intérieur de la pièce 41, et de là dans le vase d'expansion à travers le tube 36.In normal operation, air can pass from the interior of the expansion tank to the outside atmosphere by passing through the semi-permeable membrane of the assembly 37 and passing through the chamber 38, the opening 39 and the tubing 40, and air can enter the expansion tank following the reverse path. In the event of overpressure in the expansion vessel, this overpressure is transmitted through the tube 36 inside the cap-shaped part 41, which lifts by compressing the spring 43 and allows the air to reach the space 48 located inside the stopper, above the wall 34 and outside the part 41, this space also communicating with the pipe 40 through the opening 39. In the event of depression in the vessel expansion, the atmospheric pressure prevailing in the space 48 and acting on the seal 46 through the opening 47 causes the compression of the spring 45, the seal 46 releasing the opening 47 and allowing atmospheric air to penetrate to inside the part 41, and from there into the expansion tank through the tube 36.

Claims (4)

Vase d'expansion pour un circuit destiné à la circulation, sensiblement sous la pression atmosphérique, d'un fluide qui peut passer au moins en partie de l'état liquide à l'état gazeux et inversement, caractérisé en ce qu'il comprend à sa partie supérieure une membrane (23) perméable à l'air et sensiblement imperméable à la vapeur dudit fluide, montée dans un bouchon de remplissage (31) équipé de soupapes de surpression et de dépression, sur un trajet situé en parallèle avec ces deux soupapes (41-47).Expansion vessel for a circuit intended for the circulation, substantially under atmospheric pressure, of a fluid which can pass at least partly from the liquid state to the gaseous state and vice versa, characterized in that it comprises its upper part a membrane (23) permeable to air and substantially impermeable to the vapor of said fluid, mounted in a filling plug (31) equipped with pressure and vacuum valves, on a path located in parallel with these two valves (41-47). Vase d'expansion selon la revendication 1, caractérisé en ce que la membrane est maintenue par deux grilles (24,25) disposées sur ses deux faces respectivement.Expansion vessel according to claim 1, characterized in that the membrane is held by two grids (24,25) arranged on its two faces respectively. Vase d'expansion selon l'une des revendications 1 et 2, caractérisé en ce que la membrane présente des pores ouverts d'un diamètre de 3 microns environ.Expansion vessel according to either of Claims 1 and 2, characterized in that the membrane has open pores with a diameter of approximately 3 microns. Vase d'expansion selon l'une des revendications précédentes, caractérisé en ce que le bouchon comprend un corps tubulaire (32) dans lequel s'étendent une paroi transversale intermédiaire (34) et un tube central (36) dirigé vers l'intérieur du vase d'expansion à partir de celle-ci, la membrane étant de forme annulaire et s'étendant radialement autour du tube central, la paroi intermédiaire définissant dans le corps tubulaire un espace extérieur (48) qui contient les deux soupapes et qui communique avec l'intérieur du vase d'expansion exclusivement par l'intermédiaire du tube central, et un espace intérieur (38) qui communique avec l'intérieur du vase d'expansion exclusivement à travers la membrane, ces deux espaces communiquant librement avec l'atmosphère extérieure.Expansion vessel according to one of the preceding claims, characterized in that the plug comprises a tubular body (32) in which extend an intermediate transverse wall (34) and a central tube (36) directed towards the interior of the expansion vessel therefrom, the membrane being annular in shape and extending radially around the central tube, the intermediate wall defining in the tubular body an external space (48) which contains the two valves and which communicates with the interior of the expansion vessel exclusively via the central tube, and an interior space (38) which communicates with the interior of the expansion vessel exclusively through the membrane, these two spaces communicating freely with the atmosphere outside.
EP92403195A 1991-12-06 1992-11-26 Expansion tank for a boiling liquid cooling circuit Withdrawn EP0545789A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9115174A FR2684722A1 (en) 1991-12-06 1991-12-06 EXPANSION TANK FOR COOLING CIRCUIT WITH CHANGE OF STATE.
FR9115174 1991-12-06

Publications (1)

Publication Number Publication Date
EP0545789A1 true EP0545789A1 (en) 1993-06-09

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EP92403195A Withdrawn EP0545789A1 (en) 1991-12-06 1992-11-26 Expansion tank for a boiling liquid cooling circuit

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EP (1) EP0545789A1 (en)
JP (1) JPH05340246A (en)
FR (1) FR2684722A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2066718A2 (en) * 1992-05-08 1995-03-01 Behr Gmbh & Co Degassing device for cooling unit of vehicle IC engine - involves housing welded or otherwise secured to floor of compensation tank and provided with floater valve
DE102013201332A1 (en) * 2013-01-29 2014-07-31 Robert Bosch Gmbh Cooling system for battery system of vehicle, has arrangement with separator that is arranged with respect to gravity of highest level within assembly and adapted to separate coolant containing gas from cooling system
AT509435B1 (en) * 2010-02-02 2015-10-15 Vaillant Group Austria Gmbh COMPENSATION CONTAINER FOR COOLING CIRCUITS
WO2022048842A1 (en) * 2020-09-01 2022-03-10 Bayerische Motoren Werke Aktiengesellschaft Compensation reservoir for a coolant system, and motor vehicle
DE102022113569A1 (en) 2022-05-30 2023-11-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cooling system for an electric traction machine for a motor vehicle
DE102022113568A1 (en) 2022-05-30 2023-11-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cooling system for an electric traction machine for a motor vehicle, and an expansion tank for a cooling system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022054600A (en) * 2020-09-28 2022-04-07 いすゞ自動車株式会社 Cap of on-vehicle tank

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US2535974A (en) * 1947-07-02 1950-12-26 Robertshaw Fulton Controls Co Thermostatically controlled pressure cap for radiators
GB2140706A (en) * 1983-05-03 1984-12-05 Sartorius Gmbh Filter
GB2157586A (en) * 1984-04-24 1985-10-30 Sev Trent Water Authority Air valves in water supply and distribution systems
WO1990001130A1 (en) * 1988-07-21 1990-02-08 Zahnradfabrik Friedrichshafen Ag Device for equalizing pressure between machine housing and the surroundings
EP0437772A1 (en) * 1990-01-17 1991-07-24 Bayerische Motoren Werke Aktiengesellschaft Boiling liquid cooling system for a liquid cooled internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535974A (en) * 1947-07-02 1950-12-26 Robertshaw Fulton Controls Co Thermostatically controlled pressure cap for radiators
GB2140706A (en) * 1983-05-03 1984-12-05 Sartorius Gmbh Filter
GB2157586A (en) * 1984-04-24 1985-10-30 Sev Trent Water Authority Air valves in water supply and distribution systems
WO1990001130A1 (en) * 1988-07-21 1990-02-08 Zahnradfabrik Friedrichshafen Ag Device for equalizing pressure between machine housing and the surroundings
EP0437772A1 (en) * 1990-01-17 1991-07-24 Bayerische Motoren Werke Aktiengesellschaft Boiling liquid cooling system for a liquid cooled internal combustion engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2066718A2 (en) * 1992-05-08 1995-03-01 Behr Gmbh & Co Degassing device for cooling unit of vehicle IC engine - involves housing welded or otherwise secured to floor of compensation tank and provided with floater valve
AT509435B1 (en) * 2010-02-02 2015-10-15 Vaillant Group Austria Gmbh COMPENSATION CONTAINER FOR COOLING CIRCUITS
DE102013201332A1 (en) * 2013-01-29 2014-07-31 Robert Bosch Gmbh Cooling system for battery system of vehicle, has arrangement with separator that is arranged with respect to gravity of highest level within assembly and adapted to separate coolant containing gas from cooling system
WO2022048842A1 (en) * 2020-09-01 2022-03-10 Bayerische Motoren Werke Aktiengesellschaft Compensation reservoir for a coolant system, and motor vehicle
DE102022113569A1 (en) 2022-05-30 2023-11-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cooling system for an electric traction machine for a motor vehicle
DE102022113568A1 (en) 2022-05-30 2023-11-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cooling system for an electric traction machine for a motor vehicle, and an expansion tank for a cooling system

Also Published As

Publication number Publication date
FR2684722B1 (en) 1995-05-24
JPH05340246A (en) 1993-12-21
FR2684722A1 (en) 1993-06-11

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